I have read many different versions and opinions on using multiple lines. I will have 4 computers, 3 phone lines 9(going to 4 phones), and 1 Fax line. But I have a few questions:

1-If i were to have all lines and computers going at one time, how much bandwidth is needed(download/upload)?

You need about 90 kb/s up and down for each phone line, plus whatever the computers need for the jobs at hand.

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2- Can I use standard 4 line phones for this setup?

Yes, provided you hook things up properly. It means getting the output from each Vonage unit and somehow connecting it to the proper pair in your junction box. This isn't hard, but obviously it needs to be done right.

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I am going to make up a diagram in a few minutes and post. Any help is greatly appreciated. Thanks

Danny

You didn't ask, but for a business application I wouldn't commit everything to Vonage right away. I would recommend getting one Vonage line and trying it for awhile. If it meets your expectations, you can go ahead and take the full plunge. Keep in mind that a failure of your internet service for any reason kills all your Voip lines.

Thanks, that diagram was for my office, when I get into one. To start off in my home office I am going to run 2 Vonage lines, 1 phone/1 fax. Well if my internet comes from my phone provider, if I lose internet would I loose phone to or no?

If it's DSL on a phone line, it's possible to lose the internet without losing the phone as well if the server at your ISP goes down. I'm on cable and I sometimes lose internet without losing cable television. Same thing.